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60 oldjohn · 22nd Apr 2021, 4:41 pm

I had a Bush DAC90 on the bench 2 weeks ago. Thought I had a noisy valve, tapping the end of the case made it worse, also tapping the chassis sounded worse. Lightly tapping each valve made no difference. Reached across my bench to switch off the phone charger made it very noisy. Once charger was switched off no amount of tapping would make the noise. I put it down to being hand capacitance with me picking up noise from the charger.

John.

22nd Apr 2021, 4:41 pm	#6
60 oldjohn Dekatron Join Date: Dec 2004 Location: East Yorkshire, UK. Posts: 3,987	Re: HMV 1120 Very Strange Goings On I had a Bush DAC90 on the bench 2 weeks ago. Thought I had a noisy valve, tapping the end of the case made it worse, also tapping the chassis sounded worse. Lightly tapping each valve made no difference. Reached across my bench to switch off the phone charger made it very noisy. Once charger was switched off no amount of tapping would make the noise. I put it down to being hand capacitance with me picking up noise from the charger. John. __________________ My favourite text message "I'll be there in five minutes, if not read again"